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Full Discussion: Copy file and evaluate its internal variables
Top Forums Shell Programming and Scripting Copy file and evaluate its internal variables Post 302763161 by Chubler_XL on Tuesday 29th of January 2013 03:43:42 PM
Old 01-29-2013
You could use awk (nawk or gawk).

This example looks for %%var%% and expands with the value of the shell variable. Note you need to export the variable so awk can see it:

expand.sh:
Code:
awk -F% ' /%%/ {
 while(match($0, "%%[A-Za-z0-9_]+%%")) {
    tmp = substr($0, 1, RSTART-1)
    var = substr($0, RSTART+2, RLENGTH-4);
    printf "%s%s", tmp, ENVIRON[var];
    $0=substr($0,RSTART+RLENGTH);
 }
 print; next } 1' $@

template:
Code:
dbname: %%DBNAME%%
dbusername:  %%DB_USER_NAME%%
dbpwd:  %%DB_PWD%%

Test script:
Code:
DBNAME="testing1"; export DBNAME
DB_USER_NAME="Test user"; export DB_USER_NAME
DB_PWD="/home/testing1"; export DB_PWD
./expand.sh template

Last edited by Chubler_XL; 01-29-2013 at 04:46 PM.. Reason: Formatting
 

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LEARN ABOUT LINUX

service

service(8)						      System Manager's Manual							service(8)

NAME

       service - run a System V init script

SYNOPSIS

       service SCRIPT COMMAND [OPTIONS]

       service --status-all

       service --help | -h | --version

DESCRIPTION

       service runs a System V init script in as predictable environment as possible, removing most environment variables and with current working
       directory set to /.

       The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT.  The  supported  values  of  COMMAND  depend  on  the
       invoked	script,  service  passes  COMMAND and OPTIONS it to the init script unmodified.  All scripts should support at least the start and
       stop commands.  As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the  start
       command.

       service --status-all runs all init scripts, in alphabetical order, with the status command.

EXIT CODES

       service calls the init script and returns the status returned by it.

FILES

       /etc/init.d
	      The directory containing System V init scripts.

ENVIRONMENT

       LANG, TERM
	      The only environment variables passed to the init scripts.

SEE ALSO

       /etc/init.d/skeleton,
       update-rc.d(8),
       init(8),
       invoke-rc.d(8).

								     Jan 2006								service(8)
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